Int E0  - Real/32 - "p_exitcode" - Get/set Process Exit Code               [O]

   CL = 5Eh
   DX = exit code or FFFFh to get
       DH ignored when setting code
       DL = process exit code

Return: AX = status (FFFFh on error)
   if getting:
       AH = termination reason
       00h normal
       01h external termination via Ctrl-C or P_ABORT
       02h hardware (critical) error abort
       03h child did not terminate
       FFh illegal request (no child, or exit code already retrieved)
       AL = process exit code

See Also: INT E0/CL=5Dh,INT 21/AH=4Ch